Master Chief was a Spartan II which were the ones that got kidnapped at age 7 and given enhancers to make them bigger, faster, stronger, and smarter. the few Spartan II's that survived those enhancements became 7 foot tall one man armies. Jorge from Halo reach was a Spartan II, the rest of noble team were Spartan III's which were orphans that were given more speedier enhancements that didn't make them last as long but made them easier to produce. The Spartans in Halo 4 are Spartan IV's which were enlisted men and women that volunteered to become Spartans, their enhancements weren't as aggressive as the Spartan III's or as heavy as the Spartan II's so they lasted longer, but didn't become human tanks

He was Always taller...If he looked the same height as normal people during gameplay and not in cut scenes is most likely programmers putting the first person POV at the same height as everyone else either to make it easier on the game's engine or I don't know. Maybe I just don't understand the question well enough

think about it, Cortana a eight year old AI is abored your ship and is rampant. think about the damage she could potently do if she was in the anger or melancholy stage or rampancy, she could put the ships core into meltdown and destroy the enter ship and kill EVERYONE on board.
also the captain wasn't arguing that the didact wasn't a threat. he wanted MC to hand over Cortana and when he refused he tried to use force (which would have failed miserably)

Read the book Halo:Cryptum, you will see that the Didact actually wasn't as anti-human as he was in Halo 4, for some reason they made him seem like he was during the war between the humans and forerunners, however after about a thousand years of meditation he seemed to be accepting humans more. Of course I may be completely wrong seeing as in Cryptum humans were nothing compared to what they are during Halo 4.

Dealing with the storm covenant, dealing with the didact(as people who were hit by the composer from Earth have showed up on requiem as forerunner constructs and so a similar event is likely with the didact), cortana's return(she was in the forerunner equivalent to the internet that could reach at least as far as Requiem), new insurrectionists, other races/members of the covenant who did not join the storm(like the arbiter).

the flood are not gone. a great as the chief is, it took the forerunners destroying all sentient life to stop the flood, and he hasn't done anything near as ridiculous as that. the flood will be back. and they will probably involve the race the before the forerunners.

The end was talking about how the humans had gained the mantle of responsibility, and were doing a good job with it. The forerunners are not coming back, the Didact was the only one who survived the firing of the first rings, except the Librarian. and she's dead

I don't know if they retconned this, but in the books it was very heavily implied that any small object without excellent shielding would get torn apart in slipspace. The Didact fits that description, methinks.

I really want a game about the beginnings of the Spartan II program. They weren't created to fight the Covenant, the Spartans were created to be the UNSC's super Rainbow Six Counter-Terrorist force.
Playing a game about that would be so cool.

your right, but Spartans fighting humans would be woefully easy. they would have to do so much nerfing it would be stupid. read the books, the cover that stuff, and the books show just how awesome the Spartans where.

Or when those three Spartans cleared an entire bridge filled with Elites in the Halo: Wars game. That was pretty badass. While in the meantime, a strong marine sergeant kills an Elite Arbiter with luck and guts.

Also, Fargone, be careful what you wish for. First Cortana disappears, and before you know it, they'll take Master Chief and replace him with another Spartan as well..

Spartans are just soldiers. Nothing more. I think that, even if a spartan went rogue, he would be hunted down to the end of the 'verse and arrested. The armour would likely be given to another spartan, because of how amazingly expensive it is.

They aren't just soldiers, they do tend to move up the rank scale just like anybody else. Think about it like this: Master chief is at E-9, which is the highest enlistment rank the navy goes After that is commission, which goes up to O-10, which is a full admiral. There are captain spartans, there are even likely to be some admrial spartans who have served to the point where they hold command over the entire spartan force, like a general going to war alongside his men

Because technically, Captain Del Rio outranks Master Chief significantly. So does Lasky. It's the difference between officers and non-commisioned officer. Master chief is basically a Command sergeant major level guy in the navy, while Captain del rio is roughly equal to a full bird colonel, 6 full levels up after getting a commision.